Moisture carried by the seasonal winds from the northeast, together with the outer rim of strong Typhoon Sanba, could cause significant downpours in those regions, while winds reaching 100 kph could continue through the following day, the bureau said.

As of 6 p.m., Sanba was centered 980 km east-southeast of Eluanbi, Taiwan's southernmost tip, moving in a north-northwesterly direction at a speed of 19 kph and packing maximum sustained winds of 198 kph, with gusts reaching 245 kph, the bureau said.

Nevertheless, a sea warning for the typhoon was unlikely to be issued, as it was expected to move toward the Ryukyu Islands, posing no immediate threat to Taiwan, according to the forecasters.